Weighing 14 pounds and responsible for 80,000 deaths, the heart of the "Fat Man" atomic bomb ... after the US dropped a 5-ton atomic bomb, called "Little Boy," on the Japanese city of Hiroshima.

Weighing 14 pounds and responsible for approximately 80,000 deaths, the heart of the "Fat Man" atomic bomb was detonated on August 9, 1945, over the Japanese city of Nagasaki. Nicknamed after ...